cr: remove `latest_compatible_version` from gRPC api. #3745

Job	Run time
run-determination	2s
check-outdated (./)	15s
check-style (./)	43s
check-config (./)	13s
build (arduino/discovery/discovery_client)	25s
check-formatting (./)	13s
build (client_example)	21s
check-license-headers (./)	17s
build (commands/daemon/term_example)	20s
	2m 49s

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